<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            margin: 50px auto;
            width: 300px;
            height: 300px;
           
            background: maroon;
            background-image:
            linear-gradient(white 2px,transparent 0), 
            linear-gradient(90deg,white 2px,transparent 0),
            linear-gradient(hsla(0,0%,100%,.3) 1px,transparent 0),
            linear-gradient(90deg,hsla(0,0%,100%,.3) 1px,transparent 0);
            background-size:
             75px 75px, 
             75px 75px,
             15px 15px,
             15px 15px;
        }
    </style>
</head>
<body>
    <div class="box">

    </div>
</body>
</html>